The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.
![[Table of Contents]](/dwicons/b_toc.gif)
|
DNV-OSS-301 Certification and Verification of Pipelines
|
APPENDIX C
Generic Description of Project
Sub-phases
App.C
A. General
App.C
A 100 Introduction
App.C A
101 A great deal of confusion can occur in projects over the precise
meaning of the various project phases. The precise meanings are
not, by themselves, important provided that everybody working on
a particular project is consistent in the use and understanding
of such meanings.
App.C A
102 Some examples of descriptions of project sub-phases or milestones
are given below. These descriptions are not intended to be precise
definitions but are given as suggestions as to how particular project-specific
definitions can look.App.C
B. Initial Studies
App.C
B 100 Feasibility study
App.C B
101 A feasibility study is a study directed at evaluation of the feasibility
of one or more concepts.
App.C B
102 The feasibility study is an evaluation of one or more proposed
technical concepts against project cost and schedule. It should
identify special technical problems and indicate the solution or
solve these to the degree necessary to confirm the feasibility of
the project cost and schedule.
App.C B
103 The feasibility study shall address all essential cost and schedule
aspects, and should conclude on what the most uncertain factors
are and how they should be approached. It should preferably address
aspects such as environmental impacts, special legislation etc.
that are peripheral to pipeline integrity.App.C
B 200 Concept study
App.C B
201 A concept study is a design made to establish the main dimensions
and data of the pipeline.
App.C B
202 These include, for example, diameter, wall thickness, stability
requirements, material type and corrosion protection philosophy.
Other aspects include establishment of a route corridor and identification
of possible needs for major intervention works and/or (additional)
surveys. In short, the study has to establish the basic parameters
for the work to be performed in the next stages of design and a
means for more detailed cost estimation and possibly comparison
of a number of concepts detailed to the same level.
App.C B
203 It is expected only to indicate the preferred/possible methods
or solutions of how to solve landfall zones, connection, installation,
dropped object/trawl protection, expansion, major intervention
etc. On this basis it is expected that the concept study documentation
identifies how far the design has reach, what needs to be further
detailed/investigated and how the designer foresees the
use of the given information as part of the subsequent design.App.C
C. Design
App.C
C 100 Basic design
App.C C
101 Basic design is a design made to establish the main dimensions
and data of the pipeline to a level where it is possible to make
a detailed cost estimate and to place fabrication orders without
taking any significant economic risk.
App.C C
102 The following should be defined; final route, diameter, wall
thickness, stability requirements (i.e. length of pipe with concrete
coating and length of trenching and/or volume of rock dumping),
insulation/cooling requirements, corrosion protection (i.e.
number and type of anodes and type and thickness of ant-corrosion
coating), material type and total length of required linepipe, type
and number of buckle arrestors, number and depth of crossings, required
seabed preparations, landfall design, dropped object/trawl
protection requirements, number and type of tie-ins and installation
requirement. In short, to establish a design for which only local
details remain to be defined.
App.C C
103 On this basis, it is expected that a large part of the basic design
documentation will be the final design documentation and that it
identifies what needs to be further detailed/investigated
and how this shall be done by the designer.App.C
C 200 Detail design
App.C C
201 Detail design means the finalisation of design. It can entail
all stages of design, as it does not necessarily have to be preceded
by another distinct phase. It shall address all design issues for
all items of the pipeline system and finalise all the specifications
for the subsequent production phases.App.C
D. Other Phases
App.C
D 100 General
App.C D
101 Descriptions of other project phases, such as Construction
(manufacturing, fabrication, installation, hook-up and commissioning)
or Operations are not given, as there is rarely any confusion of
their meaning or extent.
![[-]](/dwicons/i_colpse.gif)